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40 GROUNDWATER ANALYTICAL RESULTS <br /> Groundwater laboratory analytical results are summarized in Table 1 In the Second Quarter 2004, a <br /> sheen of free product was observed on the water surface in groundwater monitoring well MW-3 The <br />' highest TPHg concentration was detected in MW-3 at 89,000 micrograms per liter (ug/1) Benzene <br /> was detected in three wells with the highest concentration in MW-3 at 2,400 ug/l The highest MTBE <br /> concentration was detected in MW-1 at 52 ug/l MTBE was also present in wells MW-2, MW-4 and <br /> MW-5 at concentrations that range from 10 to 21 ug/1 Other FOCs were not detected above the <br /> laboratory reporting limits in samples collected from the groundwater monitoring wells Well AS-1, <br />' located within the source area and screened from 40 to 45 feet below ground surface (bgs) (deeper <br /> than the monitoring wells), was sampled for the seventh time since the startup of remedial activities <br />' The groundwater sample collected from AS-1 did not contain concentrations of TPHg, BTEX, or <br /> FOCs above the laboratory reporting limits (Table 1) Copies of the laboratory analytical reports and <br /> chain-of-custody documents for the groundwater samples wells are included in Appendix C <br /> A decreasing contaminant trend in groundwater has been observed since the start of renmediation in <br /> the Third Quarter 2002 (September 2002) through the Fourth Quarter 2003 (December 2003) The <br /> rate of contaminant declination has flattened as of First Quarter 2004 and continues flat through <br /> Second Quarter 2004 <br /> The water samples collected from domestic wells DW-2R, DW-3, and DW-4 did not contain <br /> detectable concentrations of TPHg, BTEX or FOCs Copies of the laboratory analytical reports and <br /> chain-of-custody documents for the water samples collected from the domestic wells are included in <br /> Appendix C <br /> 1 <br /> Prolcct No 58643-06-01 -9- lily 1,2004 <br />